Geiger-Müller counter

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Geiger-Müller counter

[¦gī·gər ′myül·ər ‚kau̇nt·ər]
(nucleonics)
A radiation counter that uses a Geiger-Müller tube in appropriate circuits to detect and count ionizing particles; each particle crossing the tube produces ionization of gas in the tube which is roughly independent of the particle's nature and energy, resulting in a uniform discharge across the tube. Abbreviated GM counter. Also known as Geiger counter.